Does patina stop?

[WANNAMILGAUSS]

Ok, new to the "Vintage" watch deal and would appreciate some direction and answers.

I would assume the patina is a result of some sort of failure or wear? I am talking about the dial and hands not the bezel.

Question is do the develop from creamy to orange or is that due to different years or materials uses?

Will a watch say from the 80s that has patina'd fairly quickly continue on that rate to the point where the indices? or hands just fail? Is this a fear for collectors that their patina will develop too much and ruin the look they were after?

Sorry if silly question I am look at watches at I love the look but wonder what my investment will look like in say 5 years?

To squeeze in a 2nd question is their any preference among collectors to GMT vs SUB?

Thanks